1// Copyright (C) 2004-2015 Free Software Foundation, Inc.
2//
3// This file is part of the GNU ISO C++ Library.  This library is free
4// software; you can redistribute it and/or modify it under the
5// terms of the GNU General Public License as published by the
6// Free Software Foundation; either version 3, or (at your option)
7// any later version.
8
9// This library is distributed in the hope that it will be useful,
10// but WITHOUT ANY WARRANTY; without even the implied warranty of
11// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12// GNU General Public License for more details.
13
14// You should have received a copy of the GNU General Public License along
15// with this library; see the file COPYING3.  If not see
16// <http://www.gnu.org/licenses/>.
17
18// { dg-require-fileio "" }
19
20// 27.6.1.3 unformatted input functions
21// NB: ostream has a particular "seeks" category. Adopt this for istreams too.
22// @require@ %-*.tst %-*.txt
23// @diff@ %-*.tst %-*.txt
24
25#include <istream>
26#include <sstream>
27#include <fstream>
28#include <testsuite_hooks.h>
29
30// fstreams
31void test04(void)
32{
33  typedef std::wistream::off_type off_type;
34
35  bool test __attribute__((unused)) = true;
36  std::wistream::pos_type pos01, pos02, pos03, pos04, pos05, pos06;
37  std::ios_base::iostate state01, state02;
38  const char str_lit01[] = "wistream_seeks-1.txt";
39  const char str_lit02[] = "wistream_seeks-2.txt";
40  std::wifstream if01(str_lit01, std::ios_base::in | std::ios_base::out);
41  std::wifstream if02(str_lit01, std::ios_base::in);
42  std::wifstream if03(str_lit02, std::ios_base::out | std::ios_base::trunc);
43  VERIFY( if01.good() );
44  VERIFY( if02.good() );
45  VERIFY( if03.good() );
46
47  std::wistream is01(if01.rdbuf());
48  std::wistream is02(if02.rdbuf());
49  std::wistream is03(if03.rdbuf());
50
51  pos01 = is01.tellg();
52  pos02 = is01.tellg();
53  pos03 = is02.tellg();
54  pos04 = is02.tellg();
55  pos05 = is03.tellg();
56  pos06 = is03.tellg();
57
58  // istream& seekg(pos_type)
59  // istream& seekg(off_type, ios_base::seekdir)
60
61  // cur
62  // NB: see library issues list 136. It's the v3 interp that seekg
63  // only sets the input buffer, or else istreams with buffers that
64  // have _M_mode == ios_base::out will fail to have consistency
65  // between seekg and tellg.
66  state01 = is01.rdstate();
67  is01.seekg(10, std::ios_base::cur);
68  state02 = is01.rdstate();
69  pos01 = is01.tellg();
70  VERIFY( pos01 == pos02 + off_type(10) );
71  VERIFY( state01 == state02 );
72  pos02 = is01.tellg();
73  VERIFY( pos02 == pos01 );
74
75  state01 = is02.rdstate();
76  is02.seekg(10, std::ios_base::cur);
77  state02 = is02.rdstate();
78  pos03 = is02.tellg();
79  VERIFY( pos03 == pos04 + off_type(10) );
80  VERIFY( state01 == state02 );
81  pos04 = is02.tellg();
82  VERIFY( pos03 == pos04 );
83
84  state01 = is03.rdstate();
85  is03.seekg(10, std::ios_base::cur);
86  state02 = is03.rdstate();
87  pos05 = is03.tellg();
88  VERIFY( pos05 == pos06 + off_type(10) );
89  VERIFY( state01 == state02 );
90  pos06 = is03.tellg();
91  VERIFY( pos05 == pos06 );
92
93  // beg
94  state01 = is01.rdstate();
95  is01.seekg(20, std::ios_base::beg);
96  state02 = is01.rdstate();
97  pos01 = is01.tellg();
98  VERIFY( pos01 == pos02 + off_type(10) );
99  VERIFY( state01 == state02 );
100  pos02 = is01.tellg();
101  VERIFY( pos02 == pos01 );
102
103  state01 = is02.rdstate();
104  is02.seekg(20, std::ios_base::beg);
105  state02 = is02.rdstate();
106  pos03 = is02.tellg();
107  VERIFY( pos03 == pos04 + off_type(10) );
108  VERIFY( state01 == state02 );
109  pos04 = is02.tellg();
110  VERIFY( pos03 == pos04 );
111
112  state01 = is03.rdstate();
113  is03.seekg(20, std::ios_base::beg);
114  state02 = is03.rdstate();
115  pos05 = is03.tellg();
116  VERIFY( pos05 == pos06 + off_type(10) );
117  VERIFY( state01 == state02 );
118  pos06 = is03.tellg();
119  VERIFY( pos05 == pos06 );
120}
121
122int main()
123{
124  test04();
125  return 0;
126}
127